Answer:
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Explanation:
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The population density is 56 because
It seems that you have missed the given options for this question which are the following: a) the increase in religious-based sex-abstinence programs
b) the availability and use of effective contraceptives
c) the decrease in the number of people getting married
<span> d) an increase in same-sex couplings
Based on this, the reason that is most likely why the dramatic decrease in the number of children in the average American family is the </span>the availability and use of effective contraceptives.